General astronomy

General astronomy

Industry: Astronomy

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General astronomy

alchemy

Astronomy; General astronomy

Art of bringing parts of the universe to the perfect state toward which they were thought to aspire - e.g., gold for metals, immortality for human beings.

alkali earth metal

Astronomy; General astronomy

Element in the second column of the periodic table (from the left.)

alkali metal (group I element)

Astronomy; General astronomy

Metal in the first column of the periodic table

americium (Am, 8S7/2 in ground state)

Astronomy; General astronomy

radioactive silvery metal which does not occur naturally

Apollo asteroid

Astronomy; General astronomy

One of a small group of asteroids whose orbits intersect that of Earth. They are named for the prototype, Apollo.

Successful US lunar exploration program in which the Apollo spacecraft 1 to 6 were unmanned; 7 to 10 were manned but did not land; and 11, 12 and 14 to 17 landed and returned safely. (Apollo 13 was ...

Aristotelian physics

Astronomy; General astronomy

Physics as promulgated by Aristotle; includes the hypothesis that our world is comprised of four elements, and that the universe beyond the moon is made of a fifth element and so is fundamentally ...